Kra Isthmus in the context of "Tanintharyi Region"

The Malay Peninsula is located in Mainland Southeast Asia. The landmass runs approximately north–south, and at its terminus, it is the southernmost point of the Asian continental mainland. The area contains Peninsular Malaysia, Southern Thailand, and the southernmost tip of Myanmar (Kawthaung). The island country of Singapore also has historical and cultural ties with the region.

The Titiwangsa Mountains are part of the Tenasserim Hills system and form the backbone of the peninsula and the southernmost section of the central cordillera, which runs from Tibet through the Kra Isthmus, the peninsula's narrowest point, into the Malay Peninsula. The Strait of Malacca separates the Malay Peninsula from the Indonesian island of Sumatra, and the south coast is separated from the island of Singapore by the Straits of Johor.

Southern Thailand (formerly Southern Siam and Tambralinga) is the southernmost cultural region of Thailand, separated from Central Thailand by the Kra Isthmus.

Phang Nga Bay (Thai: อ่าวพังงา, RTGS: ao phangnga [ʔàːw pʰāŋ.ŋāː]) is a 400 km (150 sq mi) bay in the Andaman Sea between the island of Phuket and the mainland of the Kra Isthmus of southern Thailand. Since 1981, an extensive section of the bay has been protected as the Ao Phang Nga National Park. The park is in Phang Nga Province, at 8°17′N 98°36′E / 8.283°N 98.600°E / 8.283; 98.600.

Limestone cliffs with caves, collapsed cave systems, and archaeological sites are found about Phang Nga Bay. Around 10,000 years ago, when sea levels were lower, it was possible to walk from Phuket and Krabi.

The Phuket Range (Thai: ทิวเขาภูเก็ต, Thio Khao Phuket, IPA: [tʰiw kʰǎw pʰuː.kèt]) is a subrange of the Tenasserim Hills in the Kra Isthmus, Thailand.

The Malay Peninsula is located in Mainland Southeast Asia. The landmass runs approximately north–south, and at its terminus, Tanjung Piai, it is the southernmost point of the Asian continental mainland. The area contains Peninsular Malaysia, Southern Thailand, and the southernmost tip of Myanmar (Kawthaung). The island country of Singapore also has historical and cultural ties with the region.

The Titiwangsa Mountains are part of the Tenasserim Hills system and form the backbone of the peninsula and the southernmost section of the central cordillera, which runs from Tibet through the Kra Isthmus, the peninsula's narrowest point, into the Malay Peninsula. The Strait of Malacca separates the Malay Peninsula from the Indonesian island of Sumatra, and the south coast is separated from the island of Singapore by the Straits of Johor.

Suphannabhum or Suvarnabhumi; later known as Suphan Buri (Thai: สุพรรณภูมิ or สุพรรณบุรี) was a Siamese city-state, that emerged in the early "Siam proper" which stretched from present-day west central Thailand to the north of the Kra Isthmus, with key historical sites at Uthong, Nakhon Pathom, Suphan Buri, and Ban Don Ta Phet (th). The kingdom is referred to as Xiān in the Chinese records since 1349, but according to the archaeological evidence in Suphan Buri, it was speculated to have emerged around the mid-12th century. However, a calculation made by Borihan Thepthani based on the information provided in the Northern Chronicle (th) says that the city of Suphan Buri was founded in 877 and became a free city-state after its suzerain, Nakhon Pathom of Kamalanka, fell to Phetchaburi in 913. Japanese scholar Tatsuo Hoshino has proposed that Suphannabhum was identified in Chinese sources as Shě Bá Ruò (舍跋若), which he further interprets as the western terminus of a trans-Mekong trade confederation in the 9th century. According to this hypothesis, the confederation comprised five polities: Pó Àn (婆岸), identified with Mueang Phon; Zhān Bó, associated with Champasri; Qiān Zhī Fú, identified with Si Thep; Mó Là (摩臘), located in the coastal region of Champa; and Shě Bá Ruò, corresponding to Suphanburi.

Suphannabhum became the center of Xiān, succeeding Phip Phli, no later than 1349, when Xiān was defeated by Luó hú (Lavo) and the tribute sent to China under the name of Xiānluó hú (Siam-Lavo or Ayutthaya Kingdom) was led by Xiān's King of Su-men-bang, in which Su-men-bang has been identified with Suphanburi. Since then, it was one of the states under the mandala confederation of Ayutthaya Kingdom and was completely merged to the Ayutthaya in 1438. However, modern scholars suggest Xiān mentioned in the Chinese and Đại Việt sources since the 11th century potentially was Ayodhya, a polity that later known as the Ayutthaya Kingdom (Xiānluó hú or Xiānluó) in the mid-14th century.

Pan Pan or Panpan was a small Hindu kingdom believed to have existed around the 3rd to 7th century CE. It is believed to have been located on the east coast of the Malay Peninsula, with opinion varying from somewhere in Kelantan or Terengganu, in modern-day Malaysia to the vicinity of Phunphin district, Surat Thani province, in modern Thailand.

According to the Chinese text Jiu Tang Shu, Pan Pan was bordered in the south with Langkasuka, and in the north with Tun Sun near the Kra Isthmus. Jacq-Hergoualc'h speculates that the border may have been south of Nakhon Si Thammarat, possibly near Songkhla.